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Long-term weight loss may be harmful to health

Hong Kong, September 7, 2010

Long-term weight loss may release into the blood industrial pollutants linked to illnesses like diabetes, hypertension and rheumatoid arthritis, researchers said on Tuesday.

These compounds are normally stored in fatty tissues, but when fat breaks down during weight loss, they get into the blood stream, said lead researcher Duk-Hee Lee at the Kyungpook National University in Daegu in South Korea.

'We are living under the strong dogma that weight loss is always beneficial, but weight gain is always harmful...but we think that increased (pollutant) levels (in the blood) due to weight loss can affect human health in a variety of ways,' she wrote in an email to Reuters.

Lee and an international team of colleagues studied 1,099 participants in the United States and concentrations of seven such compounds in their blood, they said in a paper published in the International Journal of Obesity.

'Once released into the bloodstream, these pollutants are able to reach vital organs,' the researchers said in a statement.

Those who lost most weight over 10 years had the highest concentrations of the compounds, called persistent organic pollutants (POPs), compared to those who gained or maintained a steady weight.